Releasable floating valve



June ll, '1940. J. RQBRADSHAW. 2,204,340

' RELEASABLE FLOATING VALVEv l f Filed June 1, 1939 INVENTOR.

JOHN R. BFADSHAW A TTORNEY,

Patented June l1,

amasser@ FLoA'rmG vanvn 'John nmnamsm'nunun, ompmmm so Halliburton ouwen cementmg company,

Duncan, Okla.

'Application June 1, 193s, serum. 216.169

zClaims.

This invention relates Vto floating equipment vadapted for use inlowering pipe into oil wells or -The use of iloa't collars or 1io`atshoes for'this Purpose is well known to those skilled in the art. Thepresent invention relates to a novel construc` tion by which thefloating valve and the cage therefor may be removed from the pipe inwhich it is mounted should it become necessary or desirable to do so.

In accordance. with the present invention, it is proposed to mount acheck lvalve in drill pipe, casing o'r the like, which will permit the'ilow of fluid downwardly through the pipe but vwill normally preventupward flow of uid therethrough.

If. the apparatus of the invention is mounted in drill pipe, circulationin the normal direction used in 'drilling may thus be carried outwithout any attention being paid to. the iloating assembly.

' If, however, vthe drill pipev becomes stuck or if,

' companying drawing, in which:

lat on of the mud fluid by pumping iluid down on t e outside o! the pipeand upwardly through the inside, means is provided for so'manipulatingthe iloating equipment as to permit this to be accom- Plished.

fany reason, it is desirable to reverse the circu- A'ccordingly, it isone object of the invention to devise a novel floating valve arrangementwhich may readily be released vfrom the pipe andremoved therefrom ifdesirable.

It is anotherobject of the invention to devise which may be released .bydropping a ball and exerting pump pressure on latching means whichholdsthe floating equipment in place. A

.u iloating equipment adapted for use in pipe and.

Uther objects and advantages reside incertain f novel features of thearrangement and con'struction of parts as will be apparent from the.following description taken i-n connection with the ac- Figure-l -is avertical cross-sectional view of apparatus constructed in accordancewith the invention and showing` the parts in the position which theyoccupy while -iluid is being forced I downwardly through the pipe;

'Flgure 2 is a vertical cross-sectional view of the Y1 apparatus shownin l'figure 1, with the parts 'construction and arrangement of'parts wiarrows inlf'ig'ure2and since the valve Il then seat within the cage. anofzte valve bail2lmaybeplumpecloutofthewell.v

shown in the position they occupy after the floating valve has beendreleased and fluid is being forced upwardlythrough the pipe.v v

Referring to the drawing in detail, it will be seen thatdrill pipe isthere illustrated as being I made up of sections l0 and I I connectedtogether by a special collar l2 in which the floating valve l of thepresent invention is mounted. 'I'he collar' I2 is provided with an innerannular groove Il within which a number of leaf springs I4 are l0'mounted.A Above the leaf springs Il, a split ring II of spring steel `orthe like'is mounted, this ring being somewhat conical in shape andserving as means for latching a valve cage, I I beneath the shoulder I1at the top of the annular groove Il. li

The valve cage I6 is provided with a valve seat 1I, against which thevalve body Il is adapted t0 ilt. The valve I9 may consist ofa cylinderof f rubber or the like. v

At its lower end, the valve cage il may be u provided with a rubbersealing ring 20 so that when the valve I9 isclosedA upon the seatIffiuid 'cannot ilow upwardly through the collar Il.

- Mounted withinjthe collar I2 at its upper end,

abovetheringlhisareleasingringll secured g5 to the collar I2 by means ofshear pins 2'2. A s illustrated in Figure 1, the ,lower end of the -ring21| is chamfered and extends slightly down the surface'by a sudden risein plnnp pressure and thus releasing the valve. cage Il.v from collarI2. 'The direction of circulations( mudmaytlienbereversed aaindicatedbyEEE sembly and also releasing Ill While only one embodiment'of'theinvenhas Abeen snows and described herein. it is ous that variouschangesmay-be made in departing .fromthe spirit of the in tion orscope'o! the annexied claims.'

vtertnepmszzz'siem-,themas:lmammella I claim:

1. In floating equipment for use in pipe in oil wells, a collaradaptedto be made up with the pipe, a valve cage in said collar, said valvecage having a valve therein, means for latching the valve cage againstupward movement in said collar, means for sealing-the valve cage to saidcollar and means for tripping the latching means when desired to permitsaid valve cage and the valve therein to move upwardly and out of thepipe after the pipe has been floated into the well, said latchng meansincluding a releasing ring held by shear pins to said collar and havinga valve seat on its upper end and said tripping means including a balladapted to rest upon said valve seat.

2. In floating equipment for use in pipe in oil wells, a, collar adaptedto be made up with the pipe, a valve cage in said collar, said valvecage .having a, valve therein, means for latching the J OHN R. BRADSHAW.

